How does Stata deal with missing data?

How does Stata deal with missing data?

How Stata handles missing data in Stata procedures. As a general rule, Stata commands that perform computations of any type handle missing data by omitting the row with the missing values. However, the way that missing values are omitted is not always consistent across commands, so let’s take a look at some examples.

What does 0 mean in Stata?

false
For a numeric variable such as foreign, Stata looks at the values of that variable, and not 0 is treated as true and 0 as false.

Can you undo in Stata?

It’s also very difficult to recover from mistakes—there’s no “undo” command in Stata. A do file contains the same commands you’d type in interactive Stata, but since they’re written in a permanent file they can be debugged or modified and then rerun at will.

How does Stata handle missing data?

How Stata handles missing data in Stata procedures As a general rule, Stata commands that perform computations of any type handle missing data by omitting the row with the missing values. However, the way that missing values are omitted is not always consistent across commands, so let’s take a look at some examples.

How do you find missing value?

How to Find the Missing Values. To find the missing values from a list, define the value to check for and the list to be checked inside a COUNTIF statement. If the value is found in the list then the COUNTIF statement returns the numerical value which represents the number of times the value occurs in that list.

Does Stata use SQL?

Stata does not “speak” SQL. The only role of SQL in Stata that I am aware of is that a SQL command can be passed to an SQL database through the – odbc – command.

How to check for missing values in a data step?

How to Check for Missing Values in a DATA Step You can use the N and NMISS functions to return the number of nonmissing and missing values, respectively, from a list of numeric arguments. When you check for ordinary missing numeric values, you can use code that is similar to the following: if numvar=. then do;